
3m Water Based Fireproof Sealant Anti-Fire Sealant for Construction Cp 25wb+. Up to 4 Hours Fire Rating: Provides up to 4 hours of fire protection for wall openings and penetrations. One-Part Moldable Putty: Ready-to-use, no mixing or tools required; easily molded by hand. Draft and Smoke Seal: Effectively seals against cold smoke and reduces noise transfer. Non-Corrosive & Adhesive: Safe for metal and synthetic cable jackets with excellent adhesion. Re-Enterable Design: Allows easy access after installation, saving time and money. FM Approved & UL Listed: Tested in accordance with ASTM E 814 and UL 1479 standards. OEM/ODM Services: Customization from samples available for global customers. Wide Application Range: Ideal for HVAC, electrical boxes, pipes, and blank openings.